I have checked all wiring, replaced tank,sender & constant volatage regulator. Guage will still not register. I checked guage with 3 volt battery and guage works correctly. The guage will register with the constant voltage regulator revoved from dash panel, not sure if registering correctly. I assume when regulator is attached to dash panel,it puts a ground on it! What can I check next. This is on a 1964 Falcon.

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